Technical Aspects and Structural Verification of a Footbridge with Composite Steel-Concrete Box Girder
Tomme: 66 (70) Fascicle: 2 | 2020
Pages: 9-24
Abstract text:
Footbridges, due to small loads, have very light structures in the case of small and medium size spans, when the footbridge is made of steel or composite steel concrete. Due to a low rigidity in the horizontal and vertical plane, footbridge superstructures dynamic behaviour must be verified, so that the resonance should be avoided, and the traffic comfort ensured. In order to have the dynamic parameters, frequencies and accelerations, within the acceptable range, a slight over dimensioning of the superstructure can be made. In the case of composite structures, the designer must consider the stresses derived from thermal expansion and contraction of concrete that could have a high impact in the overall behaviour, even though according to EC4, for cross-sections in the classes 1 and 2, these types of stresses can be neglected. This paper presents some aspects related to the structural design and dynamic behaviour of a composite superstructure footbridge of 31.50 m span.
Key Words:
composite structures; box girder; Eurocode; shear lag; dynamic behaviour; traffic comfort; thermal stresses; concrete shrinkage
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